Pop safety-valve.



10.848,202. PATENTED MAR. 26, 1907.

A J.PoRTEoUs.

POP SAFETY VALVE. APPLICATION FILED APR. 30, 1906.

attoznu JOHN PORTEOUS, OF CINCINNATI, OHIO.

PoP SAFETY-VALVE.

Specification of Letters Patent.

atentea March 26, 1907.

Application filed April 30, 1906. Serial No 314,395.

To all w/wrrb t 11u03/ con/cern:

Be it known that I, JOHN PoRTEoUs, a citizen of the United States of America, and a resident of Cincinnati, county of Hamilton, State of Ohio, have invented certain new and useful Improvements in Pop Safety-Valves, of which the following is a specification.

My invention relates to that class of pop safety-valves which are provided with a disk for regulating the openings in the valve-body as an auxiliary mea-ns of varying the pressure at which the valve will be raised from its seat.

The object of my invention is a means for adjusting the position of the valve in relation to the disk from the exterior of the housing.

Referring to the drawings, Figure l is a central sectional view of a pop safety-valve embodying my invention. Fig. 2 is an elevation thereof. Fig. 3 is a sectional view of the saine, taken upon line o v of Fig. l.

Referring to the parts, the housing consists of a hollow cylinder A, having an enlarged cylindrical chamber a, which is interiorly screw-threaded at its upper end to receive the cylindrical housing a, which is to surround the valve-stemA Housing a is interiorly screw-threaded at its upper end a2 and exteriorly reduced in diameter. The lower flange a3 of housing a has openings a4 in it, which put the valve-chamber a in communication with the atmosphere.

The valve consists of a disk B, having a downwardly-projecting central hollow cone b, wings B for guiding it toward its seat, an upwardly-projecting and interiorly and exteriorly screw-threaded annular collar If, and annular groove b2 in its under surface. In the groove b2 a series of perfor-ations b3 extend to the upper face of the disk. The external threads of the collar b are engaged by the threads of a regulating-disk C, whose under face is concave to fit over the disk B and whose periphery has cut in it a series of gearteeth c. The cone b receives the lower coneshaped end d of the valve-stem D, ab ove the end of which is an annular collar against which a nut d bears, whose external screwthreads engage the internal screw-threads of collar b to hold the valve-disk upon the valve-stem. Valve-stem D has a shoulder d2, between which and the tension-cap e a coiled spring E is held. The tension-cap is externally screw-threaded to engage the screw-threads upon the interior of the upper end of the housing a, the position of the tension-cap being regulated by nuts d, which engages the external screw-threads of said cap and likewise hold the annular bracket F upon the upper reduced end of the housing a. Bracket F carries a lever f, which engages a slot in the upper end of the valvestem D. The upper end. of the stem4 is housed by a cap G, whose walls are slotted to permit the entrance of the lever into the valve-stem. Chamber a has upon its side a journal-box a, in which is ournaled a Worm H, whose teeth mesh with the teeth c upon the exterior of the disk C. The outer end h of the worm is made square to receive a wrench for turning the worm and disk C.

For the main regulation of the pressure at which the valve will rise from its seat the spring E is provided, and to adjust the tension of this spring it is necessary to remove the lever f from its bracket and then to remove the cap G,when access may be had to the regulating-cap e to vary the tension of the spring E. After the tension of the spring E has been set the pressure at which the valve will rise from its seat may be auxiliarly regulated by changing the relative position of the disk C to the valve B. This may be done by actuating the worm H, which will open the ports b3 to a greater or less degree.

I have found by experience that by means of operating this worm H a variation of several pounds may be made in the pressure at which the valve will rise from its seat.

What I claim isl. In a safety-valve, the combination of a valve-housing, a valve-seat within the housing, a valve consisting of a disk with an annular groove in its face and perforations leading into the groove, a regulating-disk seating against the valve-disk to vary the size of the perforations, an actuating-arm journaled in the casing and engaging the regulating-disk and extending from the interior to the exterior of the ,housing for regulating the rela- IDO disk for Varying its position relatively to the Valve-disk.

JOHN PORTEOUS.

Witnesses:

WALTER F. MURRAY, AGNES MCCORMACK. 

